attacks. pre president ordering the flags stay lowered until april 20th. flags above u.s. embassies and military bases overseas will fly at half staff. thanks for trusting fox news with the coverage of this event. "studio b" win shepard starts right now. >> security secretary janet napolitano crossing over the wires in the last minute or so a statement saying that this bombing is not believed to be part of any larger plot. again, from the homeland security secretary, the word we have been hoping to hear for the better part of 24 hours, there is no indication of any kind that this bombing is part of a larger plot of any kind. at the moment we're live near

boylston street, a few blocks from the finish line. we're just more than the 2 hours during this program yesterday a terror attack stunned the city in celebration. sources are saying explosioned in the twin blasts were made from pressure cookers. experts say attackers previously used pressurer cookers for bomb in afghanistan in the foiled bombing in times square in 2010. a live look at massachusetts general hospital where we expect a news conference to begin moments from now with updates on the victims. a federal law enforcement source tells fox news that investigators have ruled out that saudi person of interest they were questioning and about whom we have been speaking. he is not a suspect. but boston's chief fbi agent promise, and i quote, we will good to the ends of the worth to find out who was behind the attack on patriots day. >> this remains an active investigation. our ongoing investigation in various locations goes on. however, there are no known

additional threats. we continue to interview various witnesses and process the crime scene. which could take some time. >> shepard: here are the latest numbers. three people killed, more than 170 others wounded. we learned that eight-year-old martin richard who was watching his dad run the marathon is one of those killed. a relative saying 29-year-old crystal campbell also died. she was set to take photographs of her friend's boyfriend crossing the finish line. and now we're getting a new look at the size and power of this attack. one runner captured part of her marathon on video, including her race to the finish line. look. >> shepard: the video ended after the first blast with the sound of panicked runners and

expect taters in the street. that camera was mounted on a helmet as she was running. today at the white house he president said we learned that once again the american people refuse to be terrorized. let's get right to the hospital now where authorities are giving us updates on the condition of the victims. listen. >> we had 34 patients who came to the hospital related to the marathon. 31 patients were injured in the explosion. of those 31, ten were treated and released. 12 were admitted to hospital. some with very severe injuries, and nine we triaged to a medical walkin clinic on campus, and of those nine, five were sent to the massachusetts eye and ear infirmary next door, for further evaluation, particularly of potential eardrum injuries from the blast.

i'm now going to hand it over to dr. bell, he has seen the patients on rounds and gave the update at 10:00 this morning, and i'll hand him the podium to give you an update. >> thank you. good afternoon, everybody. i have relatively good news, all things considered. i just finished rounding on all the patients, and they're doing more or less well. i am more confident than i was in the morning that no further life will be lost. and we have taken some of the patients back to the operating room to further address their wounds, but they're all stable, some of them have woken up completely, and have talked to them, and they're with clear mental status. so, overall, an optimistic message at this point.

[inaudible] >> you complete four amputations and four left. what's the status? >> we're doing well in this field. both limbs are still alive and doing well, and i hope that we will be able to'm restore both of them. we have a total of -- let's see -- six or seven patients still in critical condition. [inaudible] >> describe their injuries and why they're still -- [inaudible] >> for the -- [inaudible] >> some of them are awake right now, so they are much better than they were in the morning. but still they have suffered severe injuries. they have suffered the effect of

severe blood loss and of extensive surgical procedures and, therefore, they will be considered still in critical condition. nevertheless much better

>> a lot of us have experiences from overseas. some of us in battle fields. some in other countries but we

all have experience with blast injuries and extensive experience with traumatic injuries in general. remind you this is a team that takes care of trauma predominantly as the main scope of their surgical practice. [inaudible] >> i've been in south africa for a long period of time. and for another member of our team is actually military surgeon and has been both in afghanistan and iraq. >> can you tell us more about the -- [inaudible] >> i don't think i have anymore information than i gave you this morning. as i said previously, this bombs contained small met tallic fragments more consistent with pellets and also other small pieces of metal and also spike

points that resemble nails without heads. so, obviously a mixture of things in there. >> what is the -- [inaudible] >> i think it's a function of this hospital, that it can avail endless resources in the care of the trauma patients. trauma in general is extremely challenging because so many specialties need to be pulled over. trauma surgeons and plastic surgeons and thoracic surgeons and rehabilitation and trauma psychiatrists, you name it. really this hospital has the ability to pull all these resources to the bedside of the trauma patient. the greatest challenge which is to have all the specialties available, is really no challenge here. >> since your last update have federal investigators --

[inaudible] >> believe it or not if i'm not giving a report like now i am with a patient so no time to speak with federal investigators yet. [inaudible] >> yes. >> the other two were -- [inaudible] >> they have extensive wounds and burns. so, most of this patients suffered burns, too, from the explosive power of the bomb. and they also have extensive wounds from the shrapnel and met tallic objects that tore their skin. [inaudible] >> mostly ruptures of the tim tianimen -- tympanic membrane.

>> that's the reason we sent then over put we have heard any feedback from them in terms of how many sustained ear drug run tours. >> with regard to the critical patients can you walk us through the next 24 hours or so? what are the medical milestones and how do we know if they're out of the wood. >> the most important thing is hemodynamic stability, and we'll be looking forward in the next few hours hours to have the pats with stable blood pressures and heart beats, to not lose any blood any further, and obviously for those still intubated, still under support by the mechanical ventilator, to be able to breathe by themselves. [inaudible] >> it is amazing how many people came to the hospital today to donate blood. i don't have exact numbers, but

quite frankly, as i was walking in the corridor, was stopped by volunteers who were asking me, where is the blood bank and where can they donate blood. amazing response. >> ever seen anything like it? >> let me just add to that. i have just been speaking to the director of the blood bank, and he indicate wes have enough blood for the moment as you may know blood has a shelf life, and so thank you very much, we're okay for today, but what you can do is put your name on a list, because these patients will need transfusions over the next few days and weeks, and your contribution to the blood bank will be welcome. we don't want to be in the position of having to throw out blood because they have so much today that we can't use it all. >> progress of the -- [inaudible] >> i expect that the majority of the remaining patients, the

remaining critically ill patients, will be able to be ex-tubated and hopefully come out of the ic new a few days and maybe there's one or two that are more injured than the others. the prognosis is still uncertain at this point about the length of the ecu stay, but it's still too early to make prefixes like that. -- make predictions like that. [inaudible] >> none of the patients we have now will be discharged today. [inaudible] >> i don't think there is a single person in boston that has not suffered an emotional assault, and i don't think that the doctors and nurses and every single person in this hospital is an exception. we were all extremely moved, and i think shattered by the events. having said that, our mission is to provide care, to not be

hampered by our emotional reaction. we're all trauma surgeons and emergency medicine physicians, and we are sad to say, used to this devastating event. so we set our emotions aside and take care of the patients. [inaudible] >> yes. there will be more surgeries today and maybe tomorrow. >> can you walk us through the task of having to amputate? what you amputate and why? >> it was exclusively lower extremities. i believe most over amputations -- all of the amputations were above the knee. >> above the knee. >> yes. because essentially the leg was completely destroyed below the

knee. as i said in the morning, it wasn't a hard decision to make because we just completed ugly job that the bomb did, and these patients came to us with completely mangled, destroyed extremities, hanging by shreds of muscle and skin, and we had to go through the unfortunate task of completing the amputation. [inaudible] >> we had very little discussion. we had very little discussion with patients before hand. most of these patients were in a state of shock, and at that point we were rushing to save their lives. they were bleeding profusely,

and that wasn't the time for talk and that was the time for doing. >> can you say how many teams you have operating through the night? >> shepard: two of the heroes of this tragedy in boston. and think of what they just told us. they said that many of these patients had lost their extremists below the waist. they were in surgery for many hours. six to seven of them are still in critical. but the doctors tell us they're all better today than they were yesterday and it sounds like they're all going to make it. they have burn wounds, shrapnel wounds, lacerations on their body. many had to complete the. a potations after the lower parts of their legs were blown off. the doctors had worked overseas in afghanistan and iraq, today to save their fellow bostonians

in one of the greatest medical communities the world has known, and according to one doctor, some of the patients woke up after surgery and saw that they were not dead, and thanked the doctors, and said they were happy. some of the heroes of the carnage in boston have emerged and they're everywhere round it on boylston street, which just re-opened. mike tobin. i hate to keep can use the word extraordinary but one after another after another, the heroes out of this are just -- they're extraordinary. >> you know, that's probably the best way too put. you heard one doctor talking about the experience of these doctors, and of them had experience in combat but their day-to-day was household injuries, work place injuries, car wrecks, and all out once they were overwhelmed with injuries consistent with combat.

you hear one doctor say the decision to amputate wasn't one they needed to make. the people came in with limbs so badly battered, so badly damaged, all they had to do was finish off the work that the bomb had started. >> at this point if i have my numbers right, we have performed four amputations, and there are two more limbs that are at risk but i hope we will save those legs. reporter: massachusetts general is the first place we heard from doctors they were removing from the patients ball bearings and nails consistent with the information that the bombs were packed with ball bearings and nails to be used as shrapnel. we heard the doctor update that, indicating the bits of nails they were removing are nails without a head. no indication if the nails had the heads removed prior to the explosion or just the force of the blast taking the head off, melting the nails, projecting them toward the soft flesh of the victim. you also have the information

that the injuries were to the lower parts of the body. again, consistent with the information that when this blast came out, it went long and low across the race course. shep? >> shepard: mike tobin at the hospital where miracles have been restore. and investigators are calling this the most complex crime the city of boston has ever seen. our senior correspondent is here with me on boylston street. it's incredible what they have been able to accomplish so quickly. >> and so much left to do. multiple explosions, mass casualties, windows blown out. sidewalks and streets board yesterday and now bomb techs and k-9 units and the fbi's evidence response team they're collecting every shred of evidence, photographing photographing and documenting every single thing to put together includes and -- together clues and figure out who did this and they're asking

that win with video or home made pictures on the phones, saying this is one of most photographed places in the country before and after the blast. >> what occurred yesterday in boston was an act of cowardice. while there will be an opportunity in the future at the conclusion of this investigation to officially define this act, make no mistake, an act of cowardice and of this severity cannot be justified or explained. it can only be answered. >> part of those answers will be found down the street. they're collapsing the crime scene, trying to shrink it down and have now re-opened part of boylston. >> shepard: when we began the newscast this was all closed. a lot of debris out there. some people's valuables were there, and as people came to pick up belongings, when you run marathon you leave your bag of stuff there, they put a tag on it and page it up later. many of those people have come back and they're telling incredible stories. >> wearing their yellow and blue

jackets and hats, there were 23,000 startes had run and 17,000 finished, so there were thousands of people on the route and hundreds of them within sight of the finish line. they were 6-miles into a 26.2-mile rain, finish line in saying, and then their day is ruined by these explosions and they're -- there's chaos all around them, they're running for their lives in shock, and one of the runners was kenneth east from louisiana. he was run his fourth marathon. i asked him what the most searing image was in his head. >> the people coming out, the horror on their face, the children just screaming, crying, and you're caught up in it but you're not really part of it. i was unhurt and in between both blasts so it didn't affect me like it did others. just a horrible experience on a

beautiful day. reporter: another marathoner told me that running will be changed forever because of the shadow cast by this event. >> shepard: this marathon will be bigger next year than it's ever been. thanks inch just a minute we'll hear from some of the survivors who are here with us on boylston street today. the memories of yesterday and thoughts of the future as "studio b" continues coverage of the bombings in boston. zap technology.

arrival. with hertz gold plus rewards, you skip the counters, the lines, and the paperwork. zap. it's our fastest and easiest way to get you into your car. it's just another way you'll be traveling at the speed of hertz.

this is fox news channel's continuing coverage of the boston bombing.

i'm shepard smith on boylston street, and the chaos that followed played out in front of so many cameras. possible by what the bomber wanted. videos of people crossing the finish line and then a horrific crime. >> where are we supposed to go? >> they're taking down madly. all the stuff from the marathon. [sirens] >> shepard: cassidy who took this does video for a living. she's with us, and bruce as well, a witness who was there at the time it hand. cassityie, you were taking video of a friend? >> one of my coworkers was about to finish the race but he

actually had -- a few minutes before but at first i was bummed that i missed hem bought i wanted to tweet out a picture of him finishing the race so i went back 30 feet from the finish line to take a picture of the actual finish line and then heard the biggest sound i've ever heard and everything when chaotic. >> after that it's my understanding for a long period of time it affected you. >> yeah. i mean, the ground shook. like nothing i've ever felt before. the biggest earthquake you can imagine. my legs were shaking for hours and i still don't think i have fully internalized everything that happened. >> your legs shook for two hours. >> the legs shook. i couldn't sit at my disk or do anything productive. i couldn't focus. >> shepard: you think you were in shock or physical? >> i think it's a combination. i think for the first 20 minutes or so it was the physical action of the ground shaking undermight me, and then after that it was just that i was literally in

shock. >> shepard: bruce was on a nearby rooftop waiting for a party to begin. the boston marathon is one heck of a party and you were waiting for one to begin when the first bomb exploded. >> that's right. i was at a post race party on a building opposite the finish line. i was sitting on a couch. the blast blew me off the couch and on to the ground, and i suggested for people to move become away from the street. once i saw all they were secure i ran don the stairs on to the first floor, and i ran on to a carpet of glass blood streaks. i tore down barriers, i was there 30 seconds after the first blast. >> shepard: opposite you got blown off the couch -- you're a former medic from baghdad, right? >> a former army officer, not a medic, but i have training -- all of us have training in basic first aid and that's what i went to render.

>> shepard: we were listening to the hero doctors at mass general. what a job they did. they were talking about how these are the same sorts of casuals they saw in combat. >> that's what i saw. i saw the blast pattern go down and out so it hit the bare areas down, collapsed people on the course. the con cowssive force of the blast hit the people on the course, and most of the injuries were lower torso injuries injurd they were gruesome. >> cassityy, i wonder if you have processed it all? >> i keep trying to stay's and kind of distract myself, not even on purpose but keeps happening, and everytime i get a minute to sit and think -- when i woke up this morning, i saw this beautiful nice and then started to realize what happened yesterday wasn't a nightmare i was waking up from. it actually happened. i was actually 30 feet away from potentially dying, and people did die, and people were injured, and are still in the hospital and it's real.

it's not -- i haven't processed it fully. >> shepard: i understand. i know that history tells us, and studies have shown, that once all of us go away and the excitement of it all goes away, that's when people who were here that day have to deal with and it it's not going to be easy. >> i would say that the people i was with the party, i've talked with most of them by facebook or e-mail and we're bonded. this experience bonded us. for better or worst. and me and cassty didn't know each other and now we have bostonned over this and shared our strength and that's part of therapy. this is therapy for me, to get this out and try to understand and convey the anguish and the hurt we all feel. >> shepard: still very emotional. >> absolutely. absolutely. i met the guy dish put a town quit on a woman, and i just met the firefighter who carried the woman away. i'm on the ground, putting the turn quit on the latey, and i'm

like, you take her out of her. and then i just met this guy. i hugged him and we were kind of crying because this was a moment that had bond us together forever. >> shepard: i was there when the oklahoma city bombing happened and i don't think tim mcvey if thought all these years later those people would still be friends and say somehow in the aftermath of all of this we're stronger, we're better, we're better people. i think it's a fact. >> i think so. i mean, just like what bruce was saying, people like brush -- a lot of people like me went away from the bombing when it happened. we started to save our -- make sure that everybody was okay and get away. other people like bruce actually ran towards it and worked together to make sure that people were as okay as they could be and get them to the place where they needed to go. so brings everybody together. >> that's our victory. that our victory, bringing us together. >> shepard: nice to meet you both. good luck to you.

well, fbi investigator -- well, you know, think you could live through that? do you think you could deal with that sort of horror and then come out of it like this? i bet you could. we'll be right back. boylston street in boston. we went out and asked people a simple question: how old is the oldest person you've known? we gave people a sticker and had them show us. we learned a lot of us have known someone who's lived well into their 90s. and that's a great thing. but even though we're living longer, one thing that hasn't changed: the official retirement age.

♪ the question is how do you make sure you have the money you need to enjoy all of these years. ♪

>> shepard: right now federal investigators are briefing the united states senate intelligence committee on the attack here in boston that killed three people and wounded

now 170 others. we'll speak with the vice-chairman of the committee in just a few minutes on this newscast. meantime we're learning more about the explosives used in the twin blasts. is a mentioned earlier sources are telling us they were made from pressure cookers, the kind you might have in your house. makeshift weapons that attackers often use in other countries and even in some failed attacks here in the united states. katherine heritage covers issues of this matter for us, intelligence and beyond and is live. what else do we know about the pressure cookers? >> well, shep, two sources are telling us that investigators believe the bombs used producer cookers withball bearings and nails. a style of ied associated with the taliban and the border areas of pakistan and afghanistan. as you mentioned one was also found in the failed times square bombing in 2010 and also associated with the group al qaeda in yemen, so basically no conclusions on who or what group

may have been responsible for boston in the video, if you look closely in the shadow, you can see what appears to be pieces of flying metal consistent with the pressure cooker information. devices were placed inside black nylon backpacks and then placed in garbage cans. in some cases the injured have upwards of 30 pieces pieces of p shrapnel in lower victimouts and the that is being turned over to investigators. >> nails, or sharp objects. i can't say what they are with certain but that's how hey look like. [inaudible] >> they are numerous. numerous. people with 20, 30, 40 or more in their body. >> investigative source tells the fbi is scanning cell phone tower records for what was described as the moment of detonation, a positive hit that could allow them to identify a

phone number and trace it back to potential suspect. >> shepard: last night they had a person of interest. did some investigating and now it sound like he is a person of interest no more. >> the investigate tv source told us the saudi person of interest is fully cooperating and consented to the searches of his apartment. that's the video we have and he is not a suspect in the investigation. earlier we had signs from federal law enforcement indicating this high level of cooperation, consenting to the search, indicated he may not be of significant investigative value. he was a 20-year-old saudi on a student visa and no hits hits fm on the terror watch list, but just actually one final point. the thing that has people's attention, what i'm told is there's no significant intelligence or chatter during or immediately after this attack. and that is one of the reasons we saw such a public plea from the boston police and the fbi for people to come forward with

video and still images, to help them get handle on a pool of suspects. >> is this sounding to you more and more like a domestic matter, like somebody from here? >> i don't want to speculate. i think what we have playing out right now is a sense of the device. it's a device that we have seen overseas but as you know from our reporting in this area, there really are no boundaries anymore. you can find this information online so doesn't matter whether you're in a place like pakistan or here in the united states, the information is there for you to make these ieds. >> shepard: catherine, thank you. more end to more violence. those words from "the boston globe's" sports columnist today in a special column following the attack he spoke to runners, witnesses, and people injured in the blast. he described the marathon route as a 26.2-mile stretch of yellow

police game -- police tape, and he wrote, the whole world is watching boston. we are truly global. the hub of the running universe. so this is a good place to make a statement and now our quaint little event will never be the same. dan joins us live now. it's nice of you. thank you. >> thank you, shep. >> shepard: i'd argue on the matter of quaint little event. it's one of the most prominent races in the world, but i feela. it's going to be different now, won't it? >> when i grew up there was a bell of beef stew went to the winner. we need to hold on to those things. and it is very exclusive. it's an every many event and people on boylston street at that hour, they're every man. they're not the elite runners. >> shepard: they're not. and one could speculates that -- i read the column and i just wonder if you think that this race will now take on a

completely new flavor forever? my sense of bostonians and new englanders in general is, they can take a punch and if you want to punch them and knock them down and make them change their ways, they're not going to allow that to happen. >> we like to think that and i think that's coming forward in a big way. at this hour in our town. at the same time next year's race, what's going to happen? 26 miles how much do you secure that area? what do you do rashing all the people. the whole beaut glove marathon is the access. it's a public event. you stand by the line and cheer. just hope we can't get the thing so protected you can't enjoy it the way we always have. >> well, i'm guessing that everybody hopes that. i think the same way about day-to-day activities in the city where i live. if you couldn't just walk up to the subway and get on, couldn't just walk through central park, couldn't walk over to boston commons, the places would not be the same. isn't there a point where we have to say we know we can't be

safe all the time and that's the risk we take to go about our lives? >> that's what i do. put this erosion of our freedom -- if was in atlanta when the bomb went off there, you've go to the olympics, it's changed. you go to yankee stadium after 9/11, it's changing every day, and every year, and this is a big deal for us to have this event touched like this. >> shepard: you're a leader in this community. you're read by millions of people every day. and i wonder, what is your message to the people who run the place? >> our message, keep the marathon the way it's always been. keep on going next year, number 118. get out and cheer for your fronds. another day of freedom and liberty in america. >> shepard: i talked to a friend who said next year will b the biggest and best b marathon that's ever been. >> i hope so. >> shepard: i do, too, dan.

dan, good to see you. i hate the red sox, just so you know. bad things happened in new orleans. they were very bad. we were sad. still hate lsu. some things don't change. just a few minutes ago fbi officials updated the senate intelligence committee on their investigation, gave them the latest. it was a closed-door meeting in the federal investigators presumely told the senators some degree about what they now about who set off the bombs and we're, senator saxby was at the meeting and will be with us here live in boston.

music ... music ... music...

>> a little more than 24 hours since the blast, and they just opened up an area close. this is our first video of the actual spot where one of the blasts went off. you can see how far the camera is away. that's why it's shaking. they have been able to get up

close. a lot of work to be done there. a lot of the investigation is completely but it will be a while before folks are able to get back into that spot. lawmakers on capitol hill are taking a close look at the intelligence coming in. the house and senate intelligence committee holding closed door hearings on this investigation. remember, sources say the attacker apparently rigged pressure cookers with sharded of metal and nails and ball bearings. joining us now, the vice-chairman of the senate committee. senator, thank you. >> good to be with you. >> fully aware and appreciative of the fact we can't know anything but cue start us off with telling us what we can know? >> the press has most of the facts as we know it, shep. didn't shed a whole lot of new light on where we are with respect to the investigation. a couple of things that have happened. the taliban in pakistan said

they had nothing to do with it. that's not really surprising, but what is surprising there is that nobody else has claimed any credit for this event, and usually in the terrorist world, whoever does something of significance like this jumps out and immediately takes credit for it. the other thing of significance is the fact that the person of interest now looks like it's no longer a person of interest. he was fully cooperative and he was injured in the blast like unfortunately so many others were, and he is no longer a person of interest. so, we're kind of back to square one with regard to the who and why. >> senator, there was no claim of responsibility. there was no chatter about this before or after, it's our understanding, and that nobody has come forward. does this suggest to us that -- do they indicate in this briefing today where they're leaning toward maybe this was

not as much about terror per se as as about something we haven't identified. >> we know it was an act of terrorism. the question is was it an act of international group, was at it home-grown terrorist, which is one of our worst fears, was it what we call a lone wolf. somebody who just decided for whatever reason to take out their anger against this very soft target in boston. those are questions, shep, that unfortunately we just don't have the answer to, about the fbi and the special agent in charge there i happen to know and he is a very, very capable, bun of the best fbi agents. they're doing a good job of doing what they took get to the bottom of it in a hurry. this is a complicated case. >> shepard: perfectly clear. senator, i was at the oklahoma city bombings when they happened and it was a while before we realized timothy mcvey and some unknown accomplices were responsible for that and their

said motives behinded. do you have a sense that something of that nature may be involved here or we don't have any idea yet? >> i'm afraid we don't have any idea, shep. you look at the comparison of the centennial park beening at the '96 olympics. nobody claimed credit and a couple of wild goose chases were made at that time. right now the fbi is doing what they should do, cooperating with the massachusetts law enforcement agencies, and all of our intelligence agencies around the world, to try to do what they can to figure out the who and the what, but it is a slow go right now. >> shepard: senator, i can report to you with some degree of certainty that over the past 24 hours the city is doing better. smiles on the street.

hugging their neighbors, many said they thought we would be closer and that's what we learned at oklahoma city and columbine. do you have a message for the folks watching? >> well, boston is such a great city. i've been there many times, and they're great people in boston. it's a city that is known for its hospitality, and the city that is known worldwide for this particular race, and i heard your comments earlier, and i hope next year's race is the biggest and best ever, and i know that people in boston are going to continue to serve the best clam chowder around and great lobsters. >> shepard: no doubt about that. senator saxby chambliss, from georgia, thanks so much. appreciate it. our coverage will continue here from boston in just a moment. this is kevin. to prove to you that aleve is the better choice for him, he's agreed to give it up. that's today? [ male announcer ] we'll be with him all day as he goes back to taking tylenol. i was okay, but after lunch my knee started to hurt again.

and now i've got to take more pills. ♪ yup. another pill stop. can i get my aleve back yet? ♪ for my pain, i want my aleve. ♪ [ male announcer ] look for the easy-open red arthritis cap.

>> shepard: six minutes until 4:00 in boston. the attack here yesterday had officials around the world scrambling to beef up security but some of the biggest precautions may be in london where the next major marathon is this sunday. even before that tomorrow's funeral in london for former prime minister margaret thatcher is expected to draw enormous crowds. our resident brit is live. it's going to be a different atmosphere at london's marathon. >> it certainly is and organizers are saying they would like the marathon to be in part a tribute to the victims of the boston bombings. there will be a 30-second period of silence before each of the three starts along the marathon route. they are encouraging runners also to wear black arm bands. those arm bands are going to be given out to every single runner as they register for the race,

and of course, the police force in london and all the security forces are reviewing security, although they say they have not, at this point, stepped up any threat level. listen. >> we are working with the marathon to make sure we have all of the tactics in place we need. but i would stress again there has been no change to the terrorism threat to the uk at the moment. >> now, obviously the london security forces are used to this kind of thing. they had a lot of practice with extra security during the olympics. also worth pointing out there are major races taking place in the united states. the next one is the salt lake marathon on saturday. they're also reviewing security there, shep. >> shepard: i'm sure they are. jonathan hunt, live. our coverage continues. right after this. i'm phyllis, and i have diabetic nerve pain. when i first felt the diabetic nerve pain,

of course, i had no idea what it was. i felt like my feet were going to sleep. it progressed from there to burning like i was walking on hot coals to like a thousand bees that were just stinging my feet. i have a great relationship with my doctor. he found lyrica for me. [ female announcer ] it's known that diabetes damages nerves. lyrica is fda approved to treat diabetic nerve pain. lyrica is not for everyone. it may cause seris allergic reactions or suicidal thoughts or actions. tell yo doctor right away if you havehese, new or worsening depression, or unusuhanges in mood or behavior. or swelling, trouble breathing, rash, hives, blisters, changes in eye sit including blurry vision, muscle pain with fever, tired feeling, or skin sores from diabetes. common side effects are dizziness, sleepiness, weight gain, and swelling ofhands, legs, and feet. don't drink alcohol while taking lyrica. don't drive or use machinery until you know how lyrica affects you. ose who've had a drug or alcohol problem may be more likely to misuse lyrica. having les pain... it's a wonderful feeling.

[ female announcer ] ask your doctor about lyrica today. it's specific treatment for diabetic nerve pain. to hear more of phyllis's story, visit lyrica.com.

♪ [ male announcer ] this is a stunning work of technology. ♪ this is the 2013 lexus es and the first-ever es hybrid. this is the pursuit of perfection.